EVOLUTION-MANAGER

Edit File: ut0crc32.h

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/**************************************************//**
@file include/ut0crc32.h
CRC32 implementation

Created Aug 10, 2011 Vasil Dimov
*******************************************************/

#ifndef ut0crc32_h
#define ut0crc32_h

#include "univ.i"

/********************************************************************//**
Initializes the data structures used by ut_crc32*(). Does not do any
allocations, would not hurt if called twice, but would be pointless. */
void
ut_crc32_init();
/*===========*/

/********************************************************************//**
Calculates CRC32.
@param ptr - data over which to calculate CRC32.
@param len - data length in bytes.
@return CRC32 (CRC-32C, using the GF(2) primitive polynomial 0x11EDC6F41,
or 0x1EDC6F41 without the high-order bit) */
typedef uint32_t	(*ut_crc32_func_t)(const byte* ptr, ulint len);

/** Pointer to CRC32 calculation function. */
extern ut_crc32_func_t	ut_crc32;

#ifdef INNODB_BUG_ENDIAN_CRC32
/** Pointer to CRC32 calculation function, which uses big-endian byte order
when converting byte strings to integers internally. */
extern uint32_t ut_crc32_legacy_big_endian(const byte* buf, ulint len);
#endif /* INNODB_BUG_ENDIAN_CRC32 */

/** Text description of CRC32 implementation */
extern const char*	ut_crc32_implementation;

#endif /* ut0crc32_h */